As I understand it, the idea behind the "pile-on" is to a) remove the taser darts and b) try to prevent injury to the victim from his taser-induced "fit" (that's not the word I want, but it's descriptive).

But Dianavan's point is well taken: Why WAS the man allowed to remain without help for 10 hours in a waiting area?   

And what caused him to panic?

There are a LOT of unanswered questions here.